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2 Sheets-Sheet 1. J. BRBBN & M. M. KUCH.

OVEN.

(No Model.)

No. 525,760. Patented sept. 11, 1894.

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(Nol Model.)

J. BRBBN & M. M. KOCH.

OVEN.

Patented Sept. V11, 1894.

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*l UNITED STATES PATENT OFFICE.

JOHN ERBEN AND MAX M. KOCH, OF CLEVELAND, OHIO, ASSIGNORS TO THE H.FRANKE STEEL RANGE COMPANY, OF `SAME PLACE.

OVEN.

SYECIFICATION forming part of Letters Patent No. 525,760, datedSeptember 11, 1894.

` Application nea January 25,1894. sesamo. 498,016. (No mau.)

To all whom it may concern,.-

Beit known that we, JOHN ERBEN and MAX M. KOCH, citizens of the UnitedStates, residing at Cleveland, in the county of Cuyahoga and State ofOhio, have invented certain new and useful Improvements in Ovens; and wedo declare the following to bea full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention has relation to improvements in ovens for stoves andranges, and it has for its prime object to improve such devices byproviding a durable and eective means at a comparatively small expensefor guarding against, and when such occurs, returning warped oven platesor walls to their normal condition. l

Another object of the invention is to adapt a sheet metal oven toreceive protecting plates, whereby the unequal heating of the walls willbe guarded against and articles being baked or cooked will be preventedfrom burning or subjected to greater heat on the top than on the bottom,and vice versa.

A further obj ect of the invention is to economize in fuel by providinga regulator for the hot air currents and the particles of combustionaround and beneath the oven.

Other objects and advantages will appear from the following descriptionand claims when taken in connection with the annexed drawings, in which-Figure l, is a vertical, transverse, sectional view of an oven and firebox, constructed according to our invention. Fig. 2, is a similar viewtaken in the plane at right angles to Fig. 1.4 Fig. 3, is a detail,perspective, sectional view of the oven illustrating the improvements onan enlarged scale, and Fig. 4f, is an inverted Aplan view of thestrengthening ribs or braces for the outer bottom plate of the oven.

It is well known that sheet metal ovens are very desirable incooking-stoves and ranges, inasmuch as they may be quickly heated andthe thinner the metal used in the construction of the oven, the quickerresults can be obtained in'baking purposes. It has been 5o found veryobjectionable however to use thin sheet metal in the construction of-ovens for the reason that the great heat to which the walls aresubjected, commonly cause the bottom wall, at least, to buckle and warp,and it has been found furthermore objectionable for 5 the reason thatwhen a large fire is used, the articles baking will burn on the topbefore being cooked on the bottom. These objections we have overcome byour improvements and the additional cost to apply such im- 6 provementsin the manufacture is comparatively small. f

Referring by letter to the accompanying drawings: A, indicates the oven;B, the fire box, and C, a casing. 6

The casing and fire box may be of any suit` able character, and are hereshown simply for the purpose of illustrating the improvements we havemade on the oven and its attachments.

The oven which is suitably arranged within the casing is composed of aplate of sheet metal, shaped into rectangular form or other suitableconfiguration, and comprises the bottom wall a, the top wall b, and theside walls 7 c. VThis oven is disposed within the casing so as toprovide a top ue d, leading from the fire box over. the top of the oven,a vertical side flue e, leading down one side of the oven and ahorizontal liuc or chamber divided into two compartments f, and g, by acentral vertical partition h, which extends from one of the walls of theoven shell to about midway of the length of the horizontal iiue orchamber't, as shown.

Secured to the under side of the bottom wall a, of the oven, are ribs orbraces 7c, and Z. These ribs are preferably formed of cast iron and maybe made hollow or channeled as shown, and are disposed relativelyat-right angles to each other on the under side of said plates bymeans'of short bolts or screws m, and nuts n, or other suitablefastening devices; the heads of the screws or nuts beingv countersunk inthe plate a.

In the present illustration, we have shown a single central rib l, withtwo sets of cross ribs on 'the bottom plate of the oven but it isobvious that the number maybe increased or lessened, and disposed orarranged according 1 to the fancy or dictation of the mechanic, and theribs may be cast entire or formed in sepa- Vrate parts as may bedesired.

an aperture q, in the center or other suitableV point in the bottomplate a, of the oven, and this bolt passes down to an aperture in one ofthe cross ribs or braces secured to said oven plate, thence down througha vertically.-V disposed eye in the outer end of thevertically-.disposed partition or iiue strip h, after which it passesthrough the aperture in the angular bracket F. The lower end of thisadjusting rod is threaded as shown and nuts s, and t, are employed onsaid rod above and below the bracket for fixing its position withrespect thereto and consequently serving to adjust the Vbottom plate ofthe oven.

By providing the ribs or braces, there will be considerable rigiditygiven to the bottom plate of the oven, but even with this precaution,the intense heat to Which'it is subjected, will have a tendency tobuckle or warp the sheet, so in order to take out the warping andrestore the sheet to its normal straight condition, it is simplynecessary to manipulate the nuts upon the adjusting bolt or rod, or byany suitable means to draw down the rod and secure it. This can be veryconveniently effected by the employment of a wrench, but we do not wishto be understood as confining ourselves to any particular constructionfor removing the warp through the medium of an adjusting bolt or thelike.

Withaview of economyand saving of fuel, as well as obtaining goodresults, we have provided the flue strip or vertical partition h, belowthe oven, and about midway thereof. This strip is designed to closehalf, more or less, of the iiue or chamber t', and in order that more ofthe passage or flue may be obstructed, and the course of the heat andparticles of combustion directed entirely around the oven, we haveprovided a draft regulator or slide H. This slide H, is held in avertical position against the flue strip or partition wall h, and partlyoverlapping the same by means of a headed bolt u, and a nut v, or thelike. The slide H, is provided at a suitable point in its length with anelongated slot w,

` for the passage of the bolt u, or the slide may be otherwise suitablysustained. The slide is provided at its outer end with a transverse,vertically disposed slot I, to receive the cranked end K, of anoperating shaft L, which 'is journaled in suitable bearings, and afterpassing out through the casing is provided 'with a crank handle'M, formanipulation. It

will thus be seen that by manipulating the shaft L, the course of theheat,rsmoke, &c., will be deliected in its passage beneath the oven soas to extend over a greater area;

-thereby utilizing the same Vand effecting an economy in fuel by theVsaving of the heat.

It has sometimes been found that owing to the great heat to which thebottom plate of the oven is subjected, such plate will burn and becomeotherwise impaired, and in or- Vder that the objection should not extendinto the oven, we have provided an auxiliaryV or supplemental bottomplate N, and we have also provided a supplemental or auxiliary topplate' P, for reducing the temperature of the heat on the top of theoven, so as to obviate the burning or too rapid baking on the top beforesufficient heat has been obtained at the bottom of the articles in the Yoven. These supplemental top and bottom plates should be removable sothat in some cases, they may be taken out by the cook or attendant whenit is desired to get a high heat all around the oven. These plates areheld in position contiguous to the top and bottom plates of the mainoven and on the inner sides thereof by means of strips Q, secured in thecorners of the oven walls and against the.

sides. The strips have a flange whereby they may be attached to the sidewalls of the ovens by bolts or screws and they also have a flange toserve as a rest for said plates; the latter anges being disposed withrespect to the top and bottom main walls of the oven so as to provide aslide way between said flanges and erture S. A damper T, is employed forclos-` ing this aperture S, when it is desired that the smoke andparticles of combustion should first pass around the oven before beingdischarged into the chimney. As a convenient means of manipulating thisdamper, we provide a rod U, extending through thecasing and having onits outer end a handle V.

In operation, it will be seen that when the damper T, has been closed,the smoke, gases and particles of combustion will pass over the top ofthe oven through the iue d, thence down the side of the oven by the fluee, and

into the bottom'or horizontal flue fi, where it can be controlled by theregulator H, so as to` entirely surround the oven before being let intothe smoke pipe R, from whence it is carried oif to the chimney.

While we have shown and described the draft regulator inthe base orhorizontal flue.

of the oven, yet we have not claimed the same IIC ' two or more platestogether so as to obtain a double thickness or the slide way can be madesufficiently large to receive a thicker plate, or

even a number of separate and disconnected plates may be placed in theslide ways so that the heat desired in the oven can be controlled andthe walls protected in this way.

As a modification of the means for preventing and taking out thebuckling of the oven, we would dispense with the Vertical bolt and itspresent connections and employ a'worm gear or eccentric and we are alsoaware that still other modifications might be made in this feature ofthe invention, so we would have it understood that we reserve the rightto make such changes and alterations as may fairly fall within the scopeof our claims.

Having described our invention,-what we claim is- 1. The combinationwith a sheet metal oven, having ribs or braces on its under side, and anadjusting bolt for preventing and removing warp' in thebottom,substantially as specified.

2. A sheet metal oven having the ribs or braces secured to the underside of the bottom wall in combination with the vertically disposedbolt, taking through said bottom wall and one of the braces, and havinga bearing at its opposite end whereby said bolt may be manipulated totake out the warp of the bottom wall and also prevent the warp,substantially as specified.

3. The sheet metal oven, in combination with the fianged strips securedto the side walls in the corners thereof, and the removable platesinterposed between said strips and the top and bottom walls of the ovenrespectively, on the inner side thereof, substantially as specified.

4. The combination with a suitable casing; of an oven arranged therein,the bracket secured to the bottom of the casing, the vertically disposedadjusting bolt, arranged at one end in the bracket, and its opposite endengaging the bottom wall of the oven, and nuts or the like for adjustingthe bolt and bottom wall of the oven, substantially as specified.

In testimony whereof we affix our signatures in presence of twowitnesses.

JOHN ERBEN. MAX M. KOCH. Witnesses:

H. J. SCHNEIDER, PHILIP KNAPPENBERGER.

